MayaVi is a free, cross platform, easy-to-use scientific data visualizer. It provides a fairly powerful GUI to ease the visualization process. It is written in Python and uses the Visualization Toolkit (VTK) for the graphics. MayaVi is based on ideas from an earlier Computational Fluid Dynamics (CFD) data visualizer called VTK-CFD. The original VTK-CFD code base has been completely rewritten and redesigned.